win32api registry methods and exception handling problem

[Hung Jung Lu]

Hi,

The registry handling methods in win32api seem to have problems with
the Python exception handling. It took me some time, but I have
managed to isolate the problem to a simple program. But the problem is
more severe in more complicated situations, and there it seems to
happen with most (or all) registry methods (win32api.Reg...()).

The methods of _winreg module do not exhibit this problem. For now, I
am using _winreg. However, it would be nice if the problem could be
tracked down inside the win32api's source code and be fixed.

regards,

Hung Jung Lu

#----------------------------------------------------------------------
# OS used: Windows XP
#
# Python 2.1
#     program works correctly: correct exception message displayed
#
# Python 2.2.2 (win32all build 152)
#    (a) In Pythonwin intractive window, you get
#        SystemError: error return without exception set
#    (b) When running with python.exe, it crashes
#
# Python 2.3b1 (win32all build 153)
#    (a) In Pythonwin intractive window, you get
#        SystemError: error return without exception set
#    (b) When running with python.exe, program exits silently,
#        which is not the correct behavior
#
# Comments:
#     (a) equivalent _winreg module methods do not have problem.
#     (b) problem seems to happen with most, or all, win32api.Reg...()
#         methods, not in this particular example, but in more
#         complicated programs (involving classes)
#

import win32con
import win32api

def reg_operation():
    hkey = win32api.RegCreateKey(win32con.HKEY_CURRENT_USER,
r'Software\Spam')
    x = 3/0 # or a statement like: raise 'error'

try: reg_operation()
except: x = 5/0 # or a statement like: raise 'error'